/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: LiteralExpr.java,v 1.2.4.1 2005/09/01 15:58:53 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.compiler;

import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.PUSH;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 */
final class LiteralExpr extends Expression {

  private final String _value;
  private final String _namespace;

  /**
   * Creates a new literal expression node.
   *
   * @param value the literal expression content/value.
   */
  public LiteralExpr(String value) {
    _value = value;
    _namespace = null;
  }

  /**
   * Creates a new literal expression node.
   *
   * @param value the literal expression content/value.
   * @param namespace the namespace in which the expression exists.
   */
  public LiteralExpr(String value, String namespace) {
    _value = value;
    _namespace = namespace.equals(Constants.EMPTYSTRING) ? null : namespace;
  }

  public Type typeCheck(SymbolTable stable) throws TypeCheckError {
    return _type = Type.String;
  }

  public String toString() {
    return "literal-expr(" + _value + ')';
  }

  protected boolean contextDependent() {
    return false;
  }

  protected String getValue() {
    return _value;
  }

  protected String getNamespace() {
    return _namespace;
  }

  public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    il.append(new PUSH(cpg, _value));
  }
}
